Commit snapshot fails with Permission denied when daemonized

When running qemu with daemonize option it is impossible to run "commit all" in monitor.

I run qemu 2.7.0 under gentoo 64 bit distribution with following command line:

qemu-system-x86_64 -m 4096 -cpu host -smp 2 -enable-kvm -snapshot \
    -drive file=vm.img,if=virtio \
    -net nic,model=virtio,macaddr=11:11:11:11:11:11 \
    -net tap,ifname=tap$PORT,script=no,downscript=no \
    -vnc :1 -daemonize \
    -chardev vc,id=mon0 -mon chardev=mon0,mode=readline \
    -chardev socket,id=mon1,host=localhost,port=10001,server,nowait -mon chardev=mon1,mode=control 

I connect to vm through VNC viewer and press CTRL+ALT+2 and run "commit all" command.
Following error is shown:
`commit` error for `all`: Permission denied

When I run my VM without `daemonize` option the command "commit all" works without errors.